The Enterprise diverts from its current heading and answers a distress call asking for medical attention. When they arrive at the planet Kirk discovers a group of individuals who claim to have visited Earth during the time of the great Greek philosophers, Plato and Socrates. They plan to get McCoy to stay to lend his medical expertise... no matter what it takes.

Recap

The Enterprise gets a distress message and arrives at an uncharted planet rich in kironide, a high-energy source. Kirk, McCoy, and Spock beam down and find a Greek temple where they are greeted by a dwarf, Alexander. He brings them to the ruler, Parmen, who is suffering from an infection brought on by a scratch on his leg. His wife Philana explains that they came from a distant planet and visited Earth during its ancient Greek period, and adopted the philosophies of Plato. Now they have incredible telekinetic abilities, as demonstrated by Parmen when he lashes out in his delirium, threatening even the Enterprise in orbit. Kirk protects Alexander, who is the court jester to the small community and lacks any power. McCoy manages to sedate Parmen before he can kill Alexander...

McCoy: The release of emotion is what keeps us healthy. Emotionally healthy.Spock: That may be, Doctor. However, I have noted that the healthy release of emotion is very frequently unhealthy for those closest to you.

Parmen: Uncontrolled power will turn even saints into savages, and we can all be counted on to live down to our lowest impulses.Kirk: You're very good at making speeches, Parmen. Just make sure that this one sinks in.

Analysis

What Changed in the Remastered Version
General improvements cited on the main series page. The planet Platonius gets an orbital upgrade. A new visual is made of the Enterprise in the grip of Parmen's delirium. The display on McCoy's tricorder is upgraded.